'She decided it's now or never!' a source says.

The world’s most famous heiress is ready to share her fortune. ThoughParis Hilton has only been dating 32-year-old actor Chris Zylka for three months, a source says that doting on sister Nicky’s 10-month-old daughter Lily has the socialite yearning for a baby of her own! “Paris has always wanted kids, and at 36, she decided it’s now or never to get pregnant,” the source explains. “Her family thinks it’s a terrible idea because they don’t think Paris and Chris will last, but she’s head over heels for her him and has her mind made up.” In fact, the source adds, the lovebirds may tie the knot by next spring — and start trying for a baby right away: “They can’t wait to have a family.” Watch out, world.